Horologium

Horologium (Latin for "clock") may refer to:


 * Clock, a device for measuring the time
 * Astronomical clock, also sometimes distinguished as a horologium
 * Horologium Augusti, a solar marker built in ancient Rome by Augustus, once believed to have acted as a sundial
 * Horologium, a turret clock built in 1283 in Dunstable, UK
 * Horologium Sapientiae ("Clock of Wisdom"), a 14th-century book on spirituality by Henry Suso
 * Horologium Oscillatorium, a 17th-century book by Christiaan Huygens on pendulum clocks
 * Horologium (constellation), in the southern celestial hemisphere named in honor of Huygens's work
 * Horologium-Reticulum Supercluster, in the area of the constellation
 * Horologium (Orthodoxy), or Horologion, the book detailing the prayers at the canonical hours in Eastern Orthodoxy